delete person ref from task assignee

backend/src/main/java/de/mrsebastian/todoappdemo/backend/task/service/TaskService.java

@@ -72,6 +72,11 @@ public void updateTaskAssignee(final UUID taskId, @Nullable final TaskAssigneeDT
         }
     }
 
+    @PreAuthorize("hasAnyRole(T(de.mrsebastian.todoappdemo.backend.security.AuthoritiesEnum).TASK_ADMIN.name())")
+    public void removePersonFromTasks(final UUID personId) {
+        getTaskWithAssignee(personId).forEach(task -> taskDAService.removeAssignee(task.id()));
+    }
+
     private void checkIfExistsOrThrow(final UUID taskId) {
         if (!taskDAService.taskExsits(taskId)) {
             throw new NotFoundException(taskId, Task.class);

backend/src/main/java/de/mrsebastian/todoappdemo/backend/task/service/events/PersonEventsListener.java

@@ -0,0 +1,19 @@
+package de.mrsebastian.todoappdemo.backend.task.service.events;
+
+import de.mrsebastian.todoappdemo.backend.person.service.events.PersonDeleteEvent;
+import de.mrsebastian.todoappdemo.backend.task.service.TaskService;
+import lombok.AllArgsConstructor;
+import org.springframework.context.event.EventListener;
+import org.springframework.stereotype.Component;
+
+@Component
+@AllArgsConstructor
+public class PersonEventsListener {
+
+    private final TaskService taskService;
+
+    @EventListener
+    public void handlePersonDeletedEvent(final PersonDeleteEvent personDeleteEvent) {
+        taskService.removePersonFromTasks(personDeleteEvent.personId());
+    }
+}